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Re: greylisting on debian.org?

On Jul 10, Adrian von Bidder <avbidder@fortytwo.ch> wrote:

> AFAICT, the protocol allows the receiving end to temporarily reject email, 
> and the sending end will retry.  AFAICT QUIT is allowed after RCPT TO to 
> abort a mail transaction - and sender verification is no different from a 
> normal mail transaction in the view of the receiver.
OTOH, sender verification is evil for a different reason: if a domain
is forged by a spammer and a large number of systems receiving the
spam perform sender verification, the MX of the forged domain will be
DoS'ed. This is about as antisocial as vacation messages and replies by
antivirus software.


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